quiz 13 Flashcards
What are sea walls?
concrete walls placed at the foot of a cliff that reflect waves back to sea
What are gryones?
wooden structures built at right angles to the coast to prevent longshore drift
What are gabions?
metal cages filled with rocks and placed in areas vulnerable to erosion
What is rock armour?
Large rocks placed at the base of cliffs
What are 2 advanatages of sea walls?
1.it prevents erosion of the coast
2. it also acts as a barrier to prevent flooding
What is a disadvantage of sea walls?
its expensive to build and maintain
What are 2 advantages of gryones
- create wide beaches which slow the waves
- This gives greater protection from flooding and erosion
What is a disadvanatge of Gryones?
They starve beaches further down the coast
What are 2 advantages of gabions?
- Gabions absorb wave energy
- so reduces erosion
What is a disadvanatge of gabions?
They are a eye-sore to the public
What are 2 advanatges of rock armour?
- rock armour absorbs wave energy
- reducing erosion and flooding
What are disadvanatge of rock armour?
boulders can be moved around by strong waves so need to be replaced
What are 4 hard engineering coastal strategies?
sea walls,gabions,rock armour and gryones
What is beach nourishment and reprofilling?
sand and shingle from lower down the beach to upper part of beaches
What is Dune regeneration?
creating or restoring sand dunes by planting vegetation to stabilise the sand
What are 2 advanatges of beach nourishment and reprofilling?
- it creates wider beaches which slow the waves
- this gives greater protection from flooding and erosion
What is a disadvantage of beach nourishment and reprofilling?
its very expensive and has to be repeated
What are 2 advantages of dune regeneration?
absorb wave energy, preventing flooding and erosion
what is a disadvanatge of dune regeneration?
the protection is limited
